KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 22. N:0 7. 339 



The urus is about as long as the last pleonal segment. The first ural segment is 

 much broader, and a little longer, than the last coalesced, which is about a third part 

 broader than long. 



The uropoda. The first pair do not reach to the apex of the third pair; the ped- 

 uncle is very broad and laminar, a little broader above than below, and a trifle more than 

 twice as long as broad at the apex ; it is finely pectinated on the inner margin, and is not 

 fully twice as long as the inner ramus; the rami are lanceolate, and serrated on both 

 margins; the outer ramus is a trifle longer than the inner. The second pair reach beyond 

 the apex of the peduncle in the third pair, but do not reach to the middle of the outer ramus; 

 the peduncle does -not reach beyond the apex of the peduncle in the first pair; it is com- 

 paratively narrow, and more than four times as long as broad at the apex; it is serrated 

 on the inner margin, and is a little more than twice as long as the inner ramus; the 

 rami are lanceolate, serrated on both margins, and about equal in length, the outer rather 

 the longer. The peduncle of the third pair is broader than that of the first, about twice 

 as long as broad, and is finely pectinated along the inner margin; it is nearly three times 

 as long as the inner ramus; the rami are not as widely separated as in the preceding 

 species, are broadly ovate, equal in length, serrated on both margins, and are considerably 

 shorter than the breadth of the peduncle. 



The telson is broader than long, broadly rounded, and nearly a third part as long 

 as the last coalesced ural segment; it is scarcely more than a third part as broad, and 

 about a fifth part as long, as the peduncle of the last pair of uropoda. 



The female. 



PI. XV, fig. 16—20. 



The forepart of the body (PL XV, fig. 16) is very dilated, the perason being at 

 the middle about three times as broad as the pleon, and more than twice as broad as 

 the head. 



The head is twice as broad as long, only a fourth part deeper than long, and 

 is only a trifle longer than the first two coalesced peraeonal segments. It is more flat- 

 tened anteriorly than in the male, but without antennal groove. 



The first pair of antennae (PI. XV, fig. 17) are like that pair in the female of 

 Dairella californica, but the single flagellar joint is three times as long as the whole 

 peduncle. 



The mouth-organs are exactly like those in the male. 



The per aeon seen from above is nearly as broad as it is long. The last five seg- 

 ments are subequal in length. 



The branchial vesicles (PI. XV, fig. 19) are comparatively somewhat shorter than in 

 the male. 



The ovitectrices (PI. XV, fig. 19) are large, almost rectangular, and feebly rounded at 

 the apex. They are fully as long as the femora of the corresponding pairs of perseopoda. 



The perceopoda (PI. XV, fig. 18) closely agree with those in the male, and the 

 glands are even more developed. 



